CN110072964B - Adhesive for battery packaging material, battery container, and battery - Google Patents
Adhesive for battery packaging material, battery container, and battery Download PDFInfo
- Publication number
- CN110072964B CN110072964B CN201780077293.5A CN201780077293A CN110072964B CN 110072964 B CN110072964 B CN 110072964B CN 201780077293 A CN201780077293 A CN 201780077293A CN 110072964 B CN110072964 B CN 110072964B
- Authority
- CN
- China
- Prior art keywords
- adhesive
- packaging material
- battery
- battery packaging
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000005022 packaging material Substances 0.000 title claims abstract description 125
- 239000000853 adhesive Substances 0.000 title claims abstract description 109
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 103
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- 229920005906 polyester polyol Polymers 0.000 claims abstract description 113
- 229920005862 polyol Polymers 0.000 claims abstract description 73
- 239000000203 mixture Substances 0.000 claims abstract description 63
- 150000003077 polyols Chemical class 0.000 claims abstract description 57
- 150000007519 polyprotic acids Polymers 0.000 claims abstract description 51
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 47
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 47
- 239000000565 sealant Substances 0.000 claims abstract description 44
- 125000003118 aryl group Chemical group 0.000 claims abstract description 28
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 21
- -1 alkylene glycol Chemical compound 0.000 claims description 80
- 239000012790 adhesive layer Substances 0.000 claims description 58
- 229910052751 metal Inorganic materials 0.000 claims description 58
- 239000002184 metal Substances 0.000 claims description 58
- 239000000463 material Substances 0.000 claims description 39
- 239000007787 solid Substances 0.000 claims description 39
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 26
- 230000009477 glass transition Effects 0.000 claims description 26
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- 239000002318 adhesion promoter Substances 0.000 claims description 6
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- SRPWOOOHEPICQU-UHFFFAOYSA-N trimellitic anhydride Chemical compound OC(=O)C1=CC=C2C(=O)OC(=O)C2=C1 SRPWOOOHEPICQU-UHFFFAOYSA-N 0.000 claims description 4
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- Sealing Battery Cases Or Jackets (AREA)
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Abstract
The invention provides a battery packaging material which has excellent formability, does not cause a reduction in interlayer adhesion strength after heat fusion between sealant layers for sealing a battery element and further after a long-term durability test under high temperature and high humidity, and does not cause appearance defects such as interlayer floating. An adhesive for a battery packaging material, a battery packaging material using the adhesive, a battery container and a battery, wherein the adhesive for a battery packaging material is an adhesive for a battery packaging material comprising a polyol composition (A) and a polyisocyanate composition (B) as essential components, wherein the polyol composition (A) comprises a polyester polyol comprising a polybasic acid or a derivative thereof and a polyhydric alcohol as essential raw materials, wherein the total amount of the raw materials of the polybasic acid or the derivative thereof is a polybasic acid having an aromatic ring or a derivative thereof, and has a number average molecular weight in the range of 3000 to 100000.
Description
Technical Field
The present invention relates to a reactive adhesive used for a battery packaging material for forming a battery container or a battery pack for a secondary battery such as a lithium ion battery.
Background
As electronic devices such as mobile phones and portable personal computers have rapidly grown, there has been an increasing demand for various types of batteries such as lithium ion batteries. Among these batteries, a packaging material is used to seal electronic elements such as electrodes and electrolytes, and a metal can has been widely used.
On the other hand, in recent years, with the increase in performance of vehicles such as electric vehicles and hybrid electric vehicles, home power storage, personal computers, cameras, cellular phones, and the like, batteries are required to have various shapes and also to be thin and lightweight. However, the packaging material for a battery, which is a metal can that has been used in many cases, has a drawback that it is difficult to follow the diversification of shapes and there is a limit to weight reduction. Therefore, as a battery packaging material which can be easily processed into various shapes and can be made thin and light, there have been proposed: a film-like laminate comprising an outer layer side base material layer, an adhesive layer, a metal layer and a sealant layer laminated in this order.
In order to form a battery container or a battery pack, a battery packaging material including these film-like laminates may be formed so that the outer layer side base material layer side is convex and the sealant layer side is concave.
In the battery packaging material, the outer layer-side base material layer is an outer layer and the sealant layer is an inner layer, and the battery element is sealed by thermally welding the sealant layers located around the battery element to each other to seal the battery element at the time of assembling the battery.
Among them, a secondary battery for vehicle-mounted or household power storage is installed outdoors, and is required to have a long life, maintain adhesion between layers of plastic films, metal foils, and the like of a packaging material for a long period of time even in an open air environment, and further, to have no abnormal appearance.
In order to improve the properties of these film-like battery packaging materials, various studies have been made focusing on an adhesive layer for bonding a metal layer.
For example, patent document 1 discloses: in a laminated packaging material comprising an inner layer comprising a resin film, a1 st adhesive layer, a metal layer, a2 nd adhesive layer, and an outer layer comprising a resin film, at least one of the 1 st adhesive layer and the 2 nd adhesive layer is formed with an adhesive composition comprising a resin having an active hydrogen group in a side chain, a polyfunctional isocyanate, and a polyfunctional amine compound, whereby a packaging material having high reliability for further molding can be obtained.
Further, patent document 2 discloses: a battery packaging material having excellent moldability, no reduction in interlayer adhesion strength even after a long-term durability test, and no appearance defects such as floating between layers can be obtained by using, as an outer layer side adhesive layer of a battery packaging material having an outer layer side resin film layer, an outer layer side adhesive layer, a metal foil layer, an inner layer side adhesive layer, and a heat seal layer, an adhesive agent comprising an acrylic polyol (A) having a number average molecular weight of 10000 to 100000 and a hydroxyl value of 1to 100mgKOH/g and an isocyanate curing agent, wherein the equivalent ratio [ NCO ]/[ OH ] of isocyanate groups derived from an aromatic polyisocyanate (B) contained in the curing agent to hydroxyl groups derived from the acrylic polyol (A) is 10 to 30.
Further, patent document 3 discloses: a battery packaging material having excellent moldability, free from reduction in interlayer adhesion strength even after high temperature and high humidity and long-term durability tests at 105 · 100% RH · 168 hours, and free from appearance defects such as floating between layers, can be obtained by using, as an outer layer side adhesive layer having the same composition as in patent document 2, an adhesive comprising a polyol component (a) containing a polyester polyol (a1) and an isocyanate curing agent, wherein the isocyanate group contained in the curing agent has an equivalent ratio [ NCO ]/([ OH ] + [ COOH ]) of 0.5 to 10 relative to the total of hydroxyl groups and carboxyl groups derived from the polyol (a): 85 to 99 wt%, and an alcohol component (A2) having a 3-or more-functional group: 1to 15 wt%, wherein the polyester polyol (A1) has a number average molecular weight of 5000 to 50000 and is composed of a polybasic acid component and a polyhydric alcohol component, and the 100 mol% of the polybasic acid component contains 45 to 95 mol% of an aromatic polybasic acid component.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2008-287971
Patent document 2: japanese patent laid-open No. 2014-185317
Patent document 3: japanese patent laid-open publication No. 2015-82354
Disclosure of Invention
Problems to be solved by the invention
The purpose of the present invention is to provide a packaging material for a battery, which has excellent moldability, and which, even after the heat fusion of sealant layers for sealing a battery element, does not cause a decrease in the interlayer adhesive strength and does not cause appearance defects such as floating between layers after a long-term durability test under high temperature and high humidity; also disclosed is a reactive adhesive for battery packaging materials, which is used for producing such battery packaging materials and has excellent moldability, heat resistance and moist heat resistance.
Means for solving the problems
The present inventors have solved the above-mentioned problems by using an adhesive for a battery packaging material, which is an adhesive for a battery packaging material comprising a polyol composition (a) and a polyisocyanate composition (B) as essential components, wherein the polyol composition (a) comprises a polyester polyol comprising a polybasic acid or a derivative thereof and a polyhydric alcohol as essential raw materials, the polybasic acid or a derivative thereof being a polybasic acid having an aromatic ring or a derivative thereof as a whole, and the polyester polyol having a number average molecular weight of 3000 to 100000.
That is, the present invention provides an adhesive for a battery packaging material, which is an adhesive for a battery packaging material comprising a polyol composition (a) and a polyisocyanate composition (B) as essential components, wherein the polyol composition (a) comprises a polyester polyol comprising a polybasic acid or a derivative thereof and a polyhydric alcohol as essential raw materials, the total amount of the raw materials of the polybasic acid or the derivative thereof is a polybasic acid having an aromatic ring or a derivative thereof, and the number average molecular weight of the polyester polyol is in the range of 3000 to 100000.
The present invention also provides a battery packaging material comprising at least an outer layer-side base material layer 1, an adhesive layer 2, a metal layer 3, and a sealant layer 4 laminated in this order, wherein the adhesive layer 2 is a cured product of the adhesive for battery packaging material described above.
The present invention also provides a battery container obtained by molding the battery packaging material described above.
The present invention also provides a battery produced using the battery container described above.
ADVANTAGEOUS EFFECTS OF INVENTION
By using the adhesive for a battery packaging material of the present invention, a battery packaging material having excellent moldability, free from a decrease in interlayer adhesive strength and free from appearance defects such as floating between layers even after the heat fusion of sealant layers for sealing a battery element and further after a long-term durability test under high temperature and high humidity can be obtained. The battery container produced by using the battery packaging material of the present invention can provide a battery having excellent reliability.
Drawings
Fig. 1 shows an example of a specific embodiment of a laminate in which an outer layer side substrate layer 1, an adhesive layer 2, a metal layer 3, and a sealant layer 4 are laminated in this order according to the present invention.
Fig. 2 shows an example of a specific embodiment of a laminate in which an outer layer side substrate layer 1, an adhesive layer 2, a metal layer 3, an adhesive layer 5, and a sealant layer 4 are laminated in this order according to the present invention.
Detailed Description
(adhesive for packaging Material for Battery)
The adhesive for a battery packaging material of the present invention is an adhesive for a battery packaging material containing a polyol composition (a) and a polyisocyanate composition (B) as essential components.
(polyol composition (A) polyester polyol)
The polyol composition (a) of the present invention comprises a polyester polyol which is essentially composed of a polybasic acid or a derivative thereof and a polyhydric alcohol.
The polyester polyol used in the present invention is characterized in that it is a polyester polyol which essentially comprises a polybasic acid or derivative thereof and a polyhydric alcohol, wherein the polybasic acid or derivative thereof is a polybasic acid or derivative thereof having an aromatic ring as the whole, and the polyester polyol has a number average molecular weight in the range of 3000 to 100000 (hereinafter, simply referred to as polyester polyol (a)). The moisture and heat resistance and the moldability for maintaining the adhesiveness for a long period of time even in an open air environment can be both satisfied by using the polyester polyol as a component of the adhesive for a battery packaging material.
Specific examples of the polybasic acid having an aromatic ring or a derivative thereof used as a raw material of the polyester polyol (a) in the present invention include phthalic acid, terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1, 4-naphthalenedicarboxylic acid, 2, 5-naphthalenedicarboxylic acid, 2, 6-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, 1, 2-bis (phenoxy) ethane-p, p' -dicarboxylic acid, and anhydride-or ester-forming derivatives of these dicarboxylic acids. Specific examples of the carboxylic anhydride include phthalic anhydride, 2, 3-naphthalic anhydride, trimellitic anhydride, and pyromellitic anhydride. Specific examples of the methyl ester compounds include dimethyl terephthalate and dimethyl 2, 6-naphthalenedicarboxylate. Here, the acid anhydride refers to a carboxylic acid anhydride having 2 or more carboxyl groups in 1 molecule. These may be used alone or in combination of two or more.
Among them, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid and anhydrides thereof or methyl ester compounds thereof are preferable, and isophthalic acid, terephthalic acid, trimellitic acid and anhydrides thereof or methyl ester compounds thereof are more preferable.
In the present invention, examples of the polyol used as a raw material of the polyester polyol (a) include diols and polyols having 3 or more functional groups.
Examples of the aforementioned diols include: aliphatic diols such as ethylene glycol, diethylene glycol, propylene glycol, 1, 3-propanediol, 1, 2, 2-trimethyl-1, 3-propanediol, 2, 2-dimethyl-3-isopropyl-1, 3-propanediol, 1, 4-butanediol, 1, 3-butanediol, 3-methyl-1, 3-butanediol, 1, 5-pentanediol, 3-methyl-1, 5-pentanediol, neopentyl glycol, 1, 6-hexanediol, 1, 4-bis (hydroxymethyl) cyclohexane, and 2, 2, 4-trimethyl-1, 3-pentanediol;
ether glycols such as polyoxyethylene glycol and polyoxypropylene glycol;
modified polyether diols obtained by ring-opening polymerization of the above aliphatic diols with various compounds having a cyclic ether bond such as ethylene oxide, propylene oxide, tetrahydrofuran, ethyl glycidyl ether, propyl glycidyl ether, butyl glycidyl ether, phenyl glycidyl ether, and allyl glycidyl ether;
lactone polyester polyols obtained by polycondensation of the above aliphatic diols with various lactones such as lactonic acid (ラクタノ & ド) and epsilon-caprolactone;
bisphenols such as bisphenol a and bisphenol F;
alkylene oxide adducts of bisphenols obtained by adding ethylene oxide, propylene oxide or the like to bisphenols such as bisphenol a and bisphenol F, and the like.
Examples of the polyol having 3 or more functional groups include: aliphatic polyhydric alcohols such as trimethylolethane, trimethylolpropane, glycerin, hexanetriol, and pentaerythritol;
modified polyether polyols obtained by ring-opening polymerization of the above aliphatic polyols with various compounds having a cyclic ether bond such as ethylene oxide, propylene oxide, tetrahydrofuran, ethyl glycidyl ether, propyl glycidyl ether, butyl glycidyl ether, phenyl glycidyl ether, and allyl glycidyl ether;
lactone polyester polyols obtained by polycondensation of the above aliphatic polyols with various lactones such as epsilon-caprolactone.
In the present invention, the polyol preferably contains a branched alkylene glycol in order to improve the appearance of the laminate.
Specifically, the branched alkylene glycol is an alkylene glycol having a tertiary carbon atom or a quaternary carbon atom in its molecular structure, and examples thereof include 1, 2, 2-trimethyl-1, 3-propanediol, 2, 2-dimethyl-3-isopropyl-1, 3-propanediol, 3-methyl-1, 3-butanediol, 3-methyl-1, 5-pentanediol, neopentyl glycol, 1, 4-bis (hydroxymethyl) cyclohexane, and 2, 2, 4-trimethyl-1, 3-pentanediol, and these may be used alone or in combination of two or more. Among these, neopentyl glycol is preferable, particularly from the viewpoint that the polyester polyol (a) excellent in moist heat resistance can be obtained.
In the present invention, the polyester polyol (a) may be a polyester polyurethane polyol which is essentially prepared from the polybasic acid or derivative thereof having an aromatic ring as a starting material, and the polyhydric alcohol and polyisocyanate. Examples of the polyisocyanate used in this case include a diisocyanate compound and a 3-or more-functional polyisocyanate compound. These polyisocyanates may be used alone or in combination of two or more.
Examples of the diisocyanate compound include: aliphatic diisocyanates such as butane-1, 4-diisocyanate, hexamethylene diisocyanate, 2, 4-trimethylhexamethylene diisocyanate, 2, 4, 4-trimethylhexamethylene diisocyanate, xylylene diisocyanate, and m-tetramethylxylylene diisocyanate;
alicyclic diisocyanates such as cyclohexane-1, 4-diisocyanate, isophorone diisocyanate, lysine diisocyanate, dicyclohexylmethane-4, 4 '-diisocyanate, 1, 3-bis (isocyanatomethyl) cyclohexane, methylcyclohexane diisocyanate, isopropylidene dicyclohexyl-4, 4' -diisocyanate, norbornane diisocyanate and the like;
aromatic diisocyanates such as 1, 5-naphthalene diisocyanate, 4 ' -diphenylmethane diisocyanate, 4 ' -diphenyldimethylmethane diisocyanate, 4 ' -diphenylmethyl diisocyanate, dialkyldiphenylmethane diisocyanate, tetraalkyldiphenylmethane diisocyanate, 1, 3-phenylene diisocyanate, 1, 4-phenylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, and tetramethylxylylene diisocyanate.
Examples of the 3-or more-functional polyisocyanate compound include an adduct type polyisocyanate compound having a urethane bond site in the molecule and a urethane type polyisocyanate compound having an isocyanurate ring structure in the molecule.
The adduct type polyisocyanate compound having a urethane bond site in the molecule can be obtained by, for example, reacting a diisocyanate compound with a polyol. Examples of the diisocyanate compound used in this reaction include various diisocyanate compounds exemplified as the aforementioned diisocyanate compounds, and these may be used alone or in combination of two or more. The polyol compound used in this reaction includes various polyol compounds exemplified as the above-mentioned polyol, and polyester polyols obtained by reacting a polyol with a polybasic acid, and these may be used alone or in combination of two or more.
The urethane polyisocyanate compound having an isocyanurate ring structure in its molecule can be obtained by reacting a diisocyanate compound with a monool and/or a diol, for example. Examples of the diisocyanate compound used in this reaction include various diisocyanate compounds exemplified as the aforementioned diisocyanate compounds, and these may be used alone or in combination of two or more. Examples of the monoalcohol used in this reaction include hexanol, 2-ethylhexanol, octanol, n-decanol, n-undecanol, n-dodecanol, n-tridecanol, n-tetradecanol, n-pentadecanol, n-heptadecanol, n-octadecanol, n-nonadecanol, eicosanol, 5-ethyl-2-nonanol, trimethylnonanol, 2-hexyldecanol, 3, 9-diethyl-6-tridecanol, 2-isoheptylisoundecanol, 2-octyldodecanol, and 2-decyltetradecanol; examples of the diol include aliphatic diols exemplified in the above-mentioned polyol. These monools and diols may be used alone or in combination.
The hydroxyl value of the solid content of the polyester polyol (A) used in the present invention is preferably in the range of 1, 0to 40.0mgKOH/g, more preferably 1.0 to 30.0mgKOH/g, and most preferably 3.0 to 25.0mgKOH/g, from the viewpoint that the adhesive strength is more excellent when used for adhesive applications and the cured adhesive layer has a crosslinking density suitable for obtaining moldability, heat resistance, and moist heat resistance.
The number average molecular weight (Mn) of the polyester polyol (a) used in the present invention is preferably in the range of 3000 to 100000, more preferably 3500 to 50000, even more preferably 4000 to 20000, even more preferably 5000 to 20000, in terms of more excellent adhesive strength when used for adhesive applications. When the number average molecular weight is less than 3000, the appearance and moldability of the laminate may be deteriorated.
On the other hand, the weight average molecular weight (Mw) is preferably in the range of 5000 to 300000, more preferably in the range of 10000 to 200000.
In the present invention, the weight average molecular weight (Mw) and the number average molecular weight (Mn) are values measured by Gel Permeation Chromatography (GPC) under the following conditions.
A measuring device: HLC-8320GPC, manufactured by Tosoh corporation
Column: TSKgel 4000HXL, TSKgel 3000HXL, TSKgel 2000HXL, TSKgel 1000HXL manufactured by Tosoh Kabushiki Kaisha
A detector: RI (differential refractometer)
Data processing: Multi-Station GPC-8020model II available from Tosoh corporation
The measurement conditions were as follows: column temperature 40 deg.C
Tetrahydrofuran as developing solvent
Flow rate 0.35 ml/min
The standard is as follows: monodisperse polystyrene
Sample preparation: obtained by filtering a tetrahydrofuran solution (0.2 mass% in terms of solid content of resin) through a microfilter (100. mu.l)
The solid acid value of the polyester polyol (A) used in the present invention is not particularly limited, but is preferably 10.0mgKOH/g or less. When the content is 5.0mgKOH/g or less, the moisture and heat resistance is further excellent when used for an adhesive, and therefore, the content is preferable. More preferably 2.0mgKOH/g or less, and still more preferably 1.8mgKOH/g or less. Most preferably 1.6mgKOH/g or less. The polyester polyol (a) described above can be obtained by the production method described later. The lower limit is better, but from the viewpoint of reactivity, it is difficult to introduce hydroxyl groups to all the terminals of the polyester polyol (a), and some of the terminals become carboxyl groups. Therefore, the solid acid value is substantially 1.0mgKOH/g or more; when the production is carried out by controlling the reaction or the like using a polyol in an excess amount relative to the polybasic acid having an aromatic ring or the derivative thereof, the amount is usually 0.5mgKOH/g or more.
The glass transition temperature of the polyester polyol (A) used in the present invention is not particularly limited, but is preferably-30 ℃ or higher, more preferably-20 ℃ or higher, and still more preferably-10 ℃ or higher, in order to suppress bleeding of the adhesive during dry lamination in the production of a laminate. In order to suppress the lifting of the rib mark during dry lamination, it is preferably 80 ℃ or lower, more preferably 70 ℃ or lower, and still more preferably 55 ℃ or lower.
The glass transition temperature in the present invention refers to a value measured by the following procedure.
Using a differential scanning calorimeter (DSC-7000, manufactured by SII Nano Technology Co., Ltd., hereinafter referred to as DSC), 5mg of a sample was heated from room temperature to 200 ℃ at 10 ℃/min under a 30mL/min nitrogen gas flow, and then cooled to-80 ℃ at 10 ℃/min. The temperature was again raised to 150 ℃ at 10 ℃/min, and the DSC curve was measured, with the intersection of the straight line extending from the base line on the low temperature side to the high temperature side in the measurement results observed in the second temperature raising step and the tangent drawn from the point where the gradient of the curve in the step-like portion of the glass transition became maximum being taken as the glass transition point, and the temperature at that time being taken as the glass transition temperature. In addition, the temperature is raised to 200 in the first temperature rise, but it is sufficient if it is a temperature at which the polyester polyol (a) is sufficiently melted, and 200 ℃ is appropriately adjusted if it is insufficient. Similarly, the cooling temperature is suitably adjusted to-80 ℃ when it is insufficient (e.g., when the glass transition temperature is lower).
The reason why the adhesive for a battery packaging material having excellent moldability, heat resistance and moist heat resistance can be obtained by using the polyester polyol (a) as described above is not clear, but can be estimated as follows. That is, by using a polybasic acid or a derivative thereof having an aromatic ring as the whole of the raw material of the polybasic acid or the derivative thereof, a rigid skeleton can be introduced into the polyester polyol, and by using a polybasic acid or a derivative thereof having a number average molecular weight (Mn) in the range of 3000 to 100000, the adhesive (adhesive layer) after the reaction has a high cohesive force and can withstand deformation during molding. In addition, it can be considered that: the rigid skeleton derived from the polybasic acid having an aromatic ring or the derivative thereof contributes to improvement in heat resistance and moist heat resistance.
One preferred embodiment of the polyester polyol (a) used in the present invention is a polyester polyol (a) essentially comprising a polybasic acid or a derivative thereof and a polyhydric alcohol, wherein the polybasic acid or a derivative thereof is a dibasic acid or a derivative thereof having an aromatic ring as the whole raw material, and the polyhydric alcohol is a polyester polyol (a) which is a dihydric alcohol.
As another preferred embodiment of the polyester polyol (a) used in the present invention, there is a polyester polyol (a) which is a polyester polyurethane polyol essentially comprising a polybasic acid or a derivative thereof, a polyhydric alcohol and a polyisocyanate as raw materials, wherein the polybasic acid or the derivative thereof is a dibasic acid or a derivative thereof having an aromatic ring as a whole, the polyhydric alcohol is a dihydric alcohol as a whole, and the polyisocyanate is a polyester polyol (a) which is a diisocyanate compound as a whole.
By including such a linear polyester polyol (a) entirely made of a 2-functional compound as a raw material in the polyol composition (a), the curing shrinkage at the time of forming a cured coating film by the reaction of the polyol composition (a) with the polyisocyanate composition (B) described later becomes small, and the deformation between substrates can be suppressed. Therefore, the adhesive for battery packaging material of the present invention has excellent adhesive strength.
In addition, by including such a polyester polyol (a) in the polyol composition (a), the stretchability of the cured coating film is improved. Therefore, the adhesive for battery packaging materials of the present invention has particularly excellent moldability.
Further, when the polyol composition (a) contains such a polyester polyol (a), the viscosity becomes low, the coating suitability is excellent, and the polyol composition (a) can be suitably used as a solvent-free adhesive or a solvent-based adhesive having a high solid content concentration as described later.
In the present specification, the phrase "all 2-functional compounds are used as raw materials" means that substantially all 2-functional compounds are used as raw materials. For example, when a diol which is industrially produced and cannot be removed cleanly in the purification stage and in which a monofunctional alcohol or a polyol having 3 or more functions remains is used as a raw material, it corresponds to the linear polyester polyol (a) which is obtained by using the above-mentioned 2-functional compound as a raw material. The same applies to the dibasic acid or derivative thereof and the diisocyanate compound.
As another preferred embodiment of the polyester polyol (a) used in the present invention, there is a polyester polyol (a) which is essentially composed of a polybasic acid or a derivative thereof and a polyhydric alcohol, wherein the polybasic acid or a derivative thereof is a polybasic acid or a derivative thereof having an aromatic ring as a whole, the polyhydric alcohol contains a branched alkylene glycol, and the content of the branched alkylene glycol is 5 mol% or more and 95 mol% or less in 100 mol% of the polyhydric alcohol.
As another preferred embodiment of the polyester polyol (a) used in the present invention, there is a polyester polyol (a) which is a polyester polyurethane polyol essentially comprising a polybasic acid or a derivative thereof, a polyhydric alcohol and a polyisocyanate as raw materials, wherein the polybasic acid or the derivative thereof is a polybasic acid or a derivative thereof having an aromatic ring as a whole, the polyhydric alcohol contains a branched alkylene glycol, and the content of the branched alkylene glycol is 5 mol% or more and 95 mol% or less in 100 mol% of the polyhydric alcohol.
By setting the content of the branched alkylene glycol to 5 mol% or more, it becomes easier to suppress the occurrence of deterioration in appearance such as orange peel lines on the adhesive surface after dry lamination. In addition, in order to ensure good fluidity and wettability to the surface of the substrate and to ensure initial adhesion strength, it is preferable to use a polyol having a relatively small volume and having no tertiary or quaternary carbon atoms in the molecular structure. From the viewpoint of achieving both excellent appearance and initial adhesive strength, the content of the branched alkylene glycol is preferably limited to 95 mol% or less.
The polyester polyol (A) used in the present invention may conform to various forms among the above-described preferred forms.
For the reaction of the above-mentioned polybasic acid having an aromatic ring or derivative thereof with the above-mentioned polyhydric alcohol; or a polybasic acid having an aromatic ring or a derivative thereof, the polyol, and the polyisocyanate may be reacted by a known method.
For example, the reaction of the polybasic acid or derivative thereof having an aromatic ring with the polyhydric alcohol can be carried out by a known and conventional polycondensation reaction (or esterification reaction) using the polybasic acid or derivative thereof having an aromatic ring, the polyhydric alcohol and a polymerization catalyst. The reaction of the aromatic ring-containing polybasic acid or derivative thereof, the polyol and the polyisocyanate can be carried out by subjecting the polyester polyol obtained by reacting the aromatic ring-containing polybasic acid or derivative thereof with the polyol by the above-described method and the polyisocyanate to a chain extension reaction in the presence of a known and conventional urethane-forming catalyst as necessary, thereby obtaining the polyester polyol (a) of the present invention.
More specifically, the esterification reaction of the polybasic acid or derivative thereof having an aromatic ring and the polyhydric alcohol is carried out by charging the polybasic acid or derivative thereof having an aromatic ring, the polyhydric alcohol and the polymerization catalyst into a reaction vessel equipped with a stirrer and a rectification device, and raising the temperature to about 130 ℃ under normal pressure while stirring. Thereafter, the resultant water is distilled off while heating at a reaction temperature in the range of 130 to 260 ℃ for 1 hour at a rate of 5 to 10 ℃. After the esterification reaction is carried out for 4 to 12 hours, the reaction is accelerated by distilling off the remaining polyol while gradually increasing the reduced pressure from the normal pressure to a range of 1to 300torr, whereby the polyester polyol (A) can be produced.
As the polymerization catalyst for the esterification reaction, preferred are: a polymerization catalyst comprising at least 1 metal selected from the group consisting of group 2, group 4, group 12, group 13, group 14 and group 15 of the periodic Table of the elements, or a compound of the metal. Examples of the polymerization catalyst containing the metal or the metal compound include metals such as Ti, Sn, Zn, Al, Zr, Mg, Hf, Ge, and compounds of these metals, and more specifically, titanium tetraisopropoxide, titanium tetrabutoxide, titanium acetylacetonate (titanyl acetate), tin octylate, 2-ethylhexyltin, zinc acetylacetonate, zirconium tetrachloride tetrahydrofuran complex, hafnium tetrachloride tetrahydrofuran complex, germanium oxide, and tetraethoxygermanium (tetraethoxygermanium).
As commercially available polymerization catalysts which can be used in the esterification reaction, organic tin catalysts, inorganic metal catalysts, and inorganic tin compounds manufactured by Matsumoto Fine Chemical company, ORGATIX TA series, TC series, ZA series, ZC series, AL series, and Nissan Chemical company are preferably used.
The amount of the polymerization catalyst is not particularly limited as long as the esterification reaction can be controlled and a good quality polyester polyol (A) can be obtained, and is, for example, 10 to 1000ppm, preferably 20 to 800ppm based on the total amount of the polybasic acid or derivative thereof and the polyhydric alcohol. Further, it is preferably 30to 500ppm in order to suppress coloration of the polyester polyol (A).
In the case of the polyester polyol (a) used in the present invention, both terminals are preferably hydroxyl groups in the case of a straight-chain polyester polyol (a); in the case of the polyester polyol (a) having a branched structure, all terminals are preferably hydroxyl groups. In order to obtain such a polyester polyol (a), the reaction may be carried out using a polyol in an excess amount relative to the polybasic acid having an aromatic ring or the derivative thereof. The amount of the polyhydric alcohol to be added may be 1.0 mol (but not 1.0 mol) to 1.4 mol, and more preferably 1.0 mol (but not 1.0 mol) to 1.2 mol, based on 1.0 mol of the polybasic acid having an aromatic ring or the derivative thereof.
The polyester-polyurethane polyol (a) used in the present invention can be obtained by chain-extending the polyester polyol (a) obtained by the above-described method with a polyisocyanate. Specifically, a polyester polyol (A), a polyisocyanate, a chain extension catalyst, and, if necessary, a good solvent for the polyester polyol (A) and the polyisocyanate are charged into a reaction vessel and stirred at a reaction temperature of 60 to 90 ℃. The reaction is carried out until isocyanate groups derived from the polyisocyanate used become substantially non-remained to obtain the polyester-urethane polyol (A) used in the present invention.
As the chain extension catalyst, a known and commonly used catalyst used as a general urethanization catalyst can be used. Specifically, there may be mentioned organotin compounds, organotin salts of organic carboxylic acids, lead carboxylates, bismuth carboxylates, titanium compounds, zirconium compounds and the like, and they may be used alone or in combination. The amount of the chain extension catalyst to be used may be an amount sufficient to promote the reaction between the polyester polyol (a) and the polyisocyanate, and specifically, is preferably 5.0 mass% or less with respect to the total amount of the polyester polyol (a) and the polyisocyanate. In order to suppress hydrolysis or coloring of the resin due to the catalyst, it is more preferably 1.0% by mass or less. Further, these chain extension catalysts can be used in consideration of the action as curing catalysts for the polyester polyol (a) and the isocyanate composition (B) described later.
Examples of the method for confirming the remaining isocyanate group include: 2260cm in absorption spectrum where the presence of passive self-isocyanate groups was confirmed by infrared absorption spectrometry-1Nearby observed absorption peaks; the isocyanate groups were quantified by titration.
Examples of the good solvent used for producing the polyester-polyurethane polyol (a) include ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, propylene glycol monomethyl ether acetate, toluene, xylene, and the like. Can be used alone or in combination of two or more.
The polyester polyol (a) used in the present invention may be used together with other reaction materials within a range not impairing the effects of the present invention.
(polyisocyanate composition (B))
The polyisocyanate composition (B) used in the present invention contains an isocyanate compound (hereinafter, referred to as isocyanate compound (B) in the present invention). The isocyanate compound (B) is not particularly limited as long as it has an isocyanate group in one molecule, and various compounds can be used. Specifically, the various diisocyanate compounds described above as the raw materials for the polyester polyol (a), adduct-modified diisocyanate compounds obtained by reacting various diisocyanate compounds with a diol compound, biuret modified products, allophanate modified products thereof, and various polyisocyanate compounds having 3 or more functions can be used. These isocyanate compounds (B) may be used alone or in combination of two or more.
Examples of the aforementioned various diisocyanate compounds include: aliphatic diisocyanate compounds such as butane-1, 4-diisocyanate, hexamethylene diisocyanate, 2, 4-trimethylhexamethylene diisocyanate, 2, 4, 4-trimethylhexamethylene diisocyanate, xylylene diisocyanate, and m-tetramethylxylylene diisocyanate;
alicyclic diisocyanate compounds such as cyclohexane-1, 4-diisocyanate, isophorone diisocyanate, lysine diisocyanate, dicyclohexylmethane-4, 4' -diisocyanate, 1, 3-bis (isocyanotomethyl) cyclohexane, and methylcyclohexane diisocyanate;
aromatic diisocyanate compounds such as 1, 5-naphthalene diisocyanate, 4 ' -diphenylmethane diisocyanate, 4 ' -diphenyldimethylmethane diisocyanate, 4 ' -diphenylmethyl diisocyanate, dialkyldiphenylmethane diisocyanate, tetraalkyldiphenylmethane diisocyanate, 1, 3-phenylene diisocyanate, 1, 4-phenylene diisocyanate, and tolylene diisocyanate. These may be used alone or in combination of two or more.
Examples of the diol compound as a reaction raw material of the adduct-modified polyisocyanate compound include ethylene glycol, propylene glycol, 1, 3-propanediol, 1, 2, 2-trimethyl-1, 3-propanediol, 2, 2-dimethyl-3-isopropyl-1, 3-propanediol, 1, 4-butanediol, 1, 3-butanediol, 3-methyl-1, 3-butanediol, 1, 5-pentanediol, 3-methyl-1, 5-pentanediol, neopentyl glycol, 1, 6-hexanediol, 1, 4-bis (hydroxymethyl) cyclohexane, 2, 2, 4-trimethyl-1, 3-pentanediol, and the like. These may be used alone or in combination of two or more.
The 3-or more-functional polyisocyanate compound is not particularly limited as long as it has 3 or more isocyanate groups in one molecule, and various compounds can be used. Specifically, there may be mentioned isocyanurate-modified polyisocyanate compounds of various diisocyanate compounds, adduct-modified polyisocyanate compounds obtained by reacting various diisocyanate compounds with a 3-or more-functional polyol compound, biuret modified products of various diisocyanate compounds, allophanate modified products of various diisocyanate compounds, and the like. These polyisocyanate compounds may be used alone or in combination of two or more.
(other Components of the adhesive for Battery packaging Material)
The adhesive for a battery packaging material of the present invention may be used in combination with other components within a range not impairing the effects of the present invention. For example, in the polyol composition (a), it is preferable that a polycarbonate polyol compound is contained in addition to the polyester polyol (a). In this case, the blending ratio of the polyester polyol compound and the polycarbonate polyol compound is preferably in the range of 30to 99.5 mass%, more preferably 60 to 99 mass%, based on the total mass of the two compounds, from the viewpoint of providing a reactive adhesive having high adhesion to various substrates and excellent moist heat resistance.
The number average molecular weight (Mn) of the polycarbonate polyol compound is preferably in the range of 300to 2000, from the viewpoint of providing an adhesive agent having high adhesion to various substrates and excellent moist heat resistance. The hydroxyl value is preferably in the range of 30to 250mgKOH/g, more preferably in the range of 40 to 200 mgKOH/g. The polycarbonate polyol compound is preferably a polycarbonate diol compound.
In addition, the polyol composition (a) preferably contains a polyoxyalkylene-modified polyol compound in addition to the polyester polyol compound. In this case, the blending ratio of the polyester polyol compound and the polyoxyalkylene modified polyol compound is preferably in the range of 30to 99.5% by mass, more preferably in the range of 60 to 99% by mass, based on the total mass of the two compounds, from the viewpoint of providing an adhesive agent having high adhesion to various substrates and excellent moist heat resistance.
The number average molecular weight (Mn) of the polyoxyalkylene modified polyol compound is preferably in the range of 300to 2000 from the viewpoint of being an adhesive agent having high adhesion to various substrates and excellent moist heat resistance. The hydroxyl value is preferably in the range of 40 to 250mgKOH/g, more preferably in the range of 50 to 200 mgKOH/g. Further, the polyoxyalkylene-modified polyol compound is preferably a polyoxyalkylene-modified diol compound.
The polyol composition (A) used in the present invention may contain other resin components in addition to the polyester polyol (A). When other resin components are used, they are used preferably at 50 mass% or less, more preferably at 30 mass% or less, based on the total mass of the main component. Specific examples of the other resin component include epoxy resins. Examples of the epoxy resin include: bisphenol epoxy resins such as bisphenol a epoxy resin and bisphenol F epoxy resin; biphenyl type epoxy resins such as biphenyl type epoxy resin and tetramethylbiphenyl type epoxy resin; dicyclopentadiene-phenol addition reaction type epoxy resins, and the like. These may be used alone or in combination of two or more. Among these, bisphenol type epoxy resins are preferably used because they are adhesives having high adhesion to various substrates and excellent moist heat resistance.
The number average molecular weight (Mn) of the epoxy resin is preferably in the range of 300to 2000 from the viewpoint of being an adhesive agent having high adhesiveness to various substrates and also excellent moist heat resistance. Further, the epoxy equivalent is preferably in the range of 150 to 1000 g/equivalent.
In the case of using the epoxy resin, the ratio of the polyester polyol (a) to the epoxy resin is preferably in the range of 30to 99.5% by mass, and more preferably in the range of 60 to 99% by mass, based on the total mass of the polyester polyol (a) and the epoxy resin, from the viewpoint of providing an adhesive having high adhesiveness to various substrates and excellent moist heat resistance.
The aforementioned polyol composition (A) used in the present invention may also contain a tackifier. Examples of the tackifier include rosin-based or rosin ester-based tackifiers, terpene-based or terpene-phenol-based tackifiers, saturated hydrocarbon resins, coumarone-based tackifiers, coumarone-indene-based tackifiers, styrene resin-based tackifiers, xylene resin-based tackifiers, phenol resin-based tackifiers, and petroleum resin-based tackifiers. These may be used alone or in combination of two or more. The tackifier can be obtained by having various softening points mainly based on the molecular weight, and the softening point is preferably 80 to 160 ℃ from the viewpoints of compatibility, color tone, thermal stability and the like when it is mixed with other resins constituting the polyol composition (A). In general, the amount of the polyol composition (a) is in the range of 1to 30 parts by mass (solid content), preferably 3 to 20 parts by mass, and particularly preferably 5 to 20 parts by mass (solid content), per 100 parts by mass of the solid content of the resin.
Examples of the rosin-based or rosin ester-based resins include polymerized rosin, disproportionated rosin, hydrogenated rosin, maleated rosin (ジン modified with a number マレ ℃.: ン), fumarated rosin (ジン modified with a number フマル), and glycerin esters, pentaerythritol esters, methyl esters, ethyl esters, butyl esters, ethylene glycol esters, diethylene glycol esters, and triethylene glycol esters thereof.
Examples of the terpene-based or terpene-phenolic type include oligomeric terpene-based, α -pinene polymer, β -pinene polymer, terpene-phenolic type, aromatic modified terpene-based, hydrogenated terpene-based, and the like.
Examples of the petroleum resin system include: petroleum resins obtained by polymerizing petroleum fractions having 5 carbon atoms, such as pentene, pentadiene, and isoprene; petroleum resins obtained by polymerizing petroleum fractions having 9 carbon atoms, such as indene, methylindene, vinyltoluene, styrene, α -methylstyrene, and β -methylstyrene; C5-C9 copolymerized petroleum resins obtained from the aforementioned various monomers and petroleum resins obtained by hydrogenating them; petroleum resins derived from cyclopentadiene and dicyclopentadiene; and hydrides of these petroleum resins; modified petroleum resins obtained by modifying these petroleum resins with maleic anhydride, maleic acid, fumaric acid, (meth) acrylic acid, phenol, or the like.
As the phenol resin system, a condensate of phenol and formaldehyde can be used. Examples of the phenol include phenol, m-cresol, 3, 5-xylenol, p-alkylphenol, and resorcinol, and examples thereof include resol resins obtained by addition reaction of these phenols with formaldehyde using an alkali catalyst, and novolaks obtained by condensation reaction using an acid catalyst. Further, a rosin phenol resin obtained by adding phenol to rosin using an acid catalyst and thermally polymerizing the phenol resin, and the like can be exemplified.
Among these, hydrogenated rosin-based resins having a softening point of 80 to 160 ℃ are preferable, and hydrogenated rosin-based resins having a softening point of 90 to 110 ℃ are more preferable; more preferably hydrogenated rosin having an acid value of 2 to 10mgKOH/g and a hydroxyl value of 5mgKOH/g or less.
In addition, terpene phenol resin with softening point of 80-160 ℃ is preferable, and terpene phenol resin with softening point of 100-140 ℃ is more preferable.
This can improve the work formability.
The adhesive composition of the present invention may contain a ketone resin. As the ketone resin, known and customary ones can be used, and a formaldehyde resin, a cyclohexanone-formaldehyde resin, a ketone-aldehyde condensation resin, or the like can be suitably used.
In the case of using the ketone resin, the blending ratio (both solid contents) of the polyester polyol (a) and the ketone resin is preferably in the range of 30to 99.5% by mass, more preferably in the range of 60 to 99% by mass, with respect to the total mass of the polyester polyol (a) and the ketone resin, in view of providing an adhesive having high adhesiveness to various substrates and excellent moist heat resistance.
Further, as another preferable embodiment, a known phosphoric acid or a derivative thereof can be used in combination with the adhesive of the present invention. Thus, the initial adhesiveness of the adhesive can be further improved, and the problems such as rib mark floating can be solved.
Examples of the phosphoric acids or derivatives thereof used herein include: phosphoric acids such as hypophosphorous acid, phosphorous acid, orthophosphoric acid, and hypophosphoric acid; condensed phosphoric acids such as metaphosphoric acid, pyrophosphoric acid, tripolyphosphoric acid, polyphosphoric acid, and superphosphoric acid; for example, monoesters, diesters, monoesters and diesters of condensed phosphoric acid and alcohols, for example, monomethyl orthophosphate, monoethyl orthophosphate, monopropyl orthophosphate, monobutyl orthophosphate, mono-2-ethylhexyl orthophosphate, monophenyl orthophosphate, monomethyl orthophosphate, monoethyl phosphite, monopropyl phosphite, monobutyl phosphite, mono-2-ethylhexyl phosphite, monophenyl phosphite, di-2-ethylhexyl orthophosphate, diphenyl orthophosphate, dimethyl phosphite, diethyl phosphite, dipropyl phosphite, dibutyl phosphite, di-2-ethylhexyl phosphite, diphenyl phosphite, etc.; for example, the phosphoric acid compound may be obtained by adding an epoxy compound such as ethylene oxide or propylene oxide; for example, epoxy phosphates obtained by adding the above-mentioned phosphoric acids to aliphatic or aromatic diglycidyl ethers.
One or more kinds of the phosphoric acids or derivatives thereof may be used. The method including this may be simply mixing.
In the adhesive of the present invention, an adhesion promoter may be used. Examples of the adhesion promoter include silane coupling agents, titanate coupling agents, aluminum-based coupling agents, and epoxy resins.
Examples of the silane coupling agent include aminosilanes such as γ -aminopropyltriethoxysilane, γ -aminopropyltrimethoxysilane, N- β (aminoethyl) - γ -aminopropyltrimethyldimethoxysilane, and N-phenyl- γ -aminopropyltrimethoxysilane; epoxy silanes such as beta- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-glycidoxypropyltriethoxysilane, and glycidooctyltrimethoxysilane; vinyl silanes such as vinyltris (β -methoxyethoxy) silane, vinyltriethoxysilane, vinyltrimethoxysilane, octenyltrimethoxysilane, γ -methacryloxypropyltrimethoxysilane, methacryloxyoctyltrimethoxysilane and the like; a polymer type silane coupling agent such as a polymer type epoxy silane obtained by introducing a plurality of alkoxysilyl groups and a plurality of epoxy groups into a polymer skeleton, and a polymer type amino silane obtained by introducing a plurality of alkoxysilyl groups and a plurality of amino groups into a polymer skeleton; hexamethyldisilazane, gamma-mercaptopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, and the like.
Examples of the titanate-based coupling agent include titanium tetraisopropoxide, titanium tetra-n-butoxide, butyl titanate dimer, tetrastearyl titanate, titanium acetylacetonate, titanium lactate, tetraoctanediol titanate, titanium lactate, and titanium tetrastearoxide.
Examples of the aluminum-based coupling agent include aluminum acetyl alkoxy diisopropoxide.
As the adhesion promoter, a silane coupling agent is preferably used, and an epoxy silane is preferably used. This can improve the work formability.
The content (solid content) of the adhesion promoter is preferably 0.1 part by mass or more, more preferably 0.3 part by mass or more, further preferably 0.5 part by mass or more, and further preferably 0.7 part by mass or more, per 100 parts by mass of the polyol composition (a) (solid content). Further, when the content of the adhesion promoter exceeds a certain amount, the degree of improvement of moldability is small, and therefore, although not particularly limited, it is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and further preferably 5 parts by mass or less with respect to 100 parts by mass of the polyol composition (a).
In the adhesive for a battery packaging material of the present invention, the ratio [ NCO ]/[ OH ] of the total number of moles [ OH ] of hydroxyl groups contained in the polyol composition (A) to the number of moles [ NCO ] of isocyanate groups contained in the polyisocyanate composition (B) is in the range of 0.5 to 30 with respect to the mixing ratio of the polyol composition (A) and the polyisocyanate composition (B), thereby providing a two-component adhesive having excellent reactivity. Wherein, [ NCO ]/[ OH ] is preferably in the range of 0.8 to 20.
The adhesive for a battery packaging material of the present invention may be in any form of a solvent type or a solvent-free type. The "solvent" referred to in the present invention means an organic solvent having high solubility in which the polyol composition (a) or polyisocyanate composition (B) used in the present invention can be dissolved; the term "solvent-free" refers to a form that does not contain such a highly soluble organic solvent, particularly ethyl acetate or methyl ethyl ketone. Specific examples thereof include esters such as ethyl acetate, butyl acetate and cellosolve acetate, ketones such as acetone, methyl ethyl ketone, isobutyl ketone and cyclohexanone, ethers such as tetrahydrofuran and dioxane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as dichloromethane and dichloroethane, dimethyl sulfoxide and dimethyl sulfonamide. Of these, it is generally preferred to use ethyl acetate or methyl ethyl ketone, alone or in combination.
In the case of a solvent-type, the solvent may be used as a reaction medium in the production of the polyol composition (a) or the polyisocyanate composition (B), and may be used as a diluent in the coating.
When the adhesive for battery packaging materials of the present invention is a solvent-based adhesive, the viscosity can be reduced by dilution with a solvent, and therefore the polyol composition (a) or polyisocyanate composition (B) used can be used even if the viscosity is slightly high. On the other hand, in the case of the solvent-free type, low viscosity is regarded as a characteristic that viscosity is lowered by heating, and as a means for lowering viscosity, an aromatic concentration that contributes to lowering viscosity is frequently used as the polyisocyanate composition (B).
The adhesive for battery packaging materials of the present invention may contain various additives such as an ultraviolet absorber, an antioxidant, a silicon-based additive, a fluorine-based additive, a rheology control agent, a defoaming agent, an antistatic agent, and an antifogging agent.
(packaging Material for Battery)
As shown in fig. 1, the battery packaging material is composed of a laminate in which at least an outer layer side base material layer 1, an adhesive layer 2, a metal layer 3, and a sealant layer 4 are laminated in this order. In the battery packaging material of the present invention, the base material layer 1 is an outermost layer, and the sealant layer 4 is an innermost layer. That is, when assembling the battery, the battery elements are sealed by thermally fusing the sealant layers 4 positioned at the peripheral edges of the battery elements to each other to seal the battery elements.
The adhesive for a battery packaging material of the present invention is used for the adhesive layer 2.
As shown in fig. 2, the battery packaging material of the present invention may be provided with an adhesive layer 5 between the metal layer 3 and the sealant layer 4 as needed for the purpose of improving the adhesion between them.
[ base Material layer 1]
In the battery packaging material of the present invention, the base material layer 1 is a layer forming an outermost layer. The material forming the base layer 1 is not particularly limited as long as it has insulation properties. Examples of the material for forming the base layer 1 include resin films such as polyester resins, polyamide resins, epoxy resins, acrylic resins, fluorine resins, polyurethane resins, silicone resins, phenol resins, and mixtures or copolymers thereof. Among these, polyester resins and polyamide resins are preferable, and biaxially stretched polyester resins and biaxially stretched polyamide resins are more preferable. Specific examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, a copolyester, and a polycarbonate. Specific examples of the polyamide resin include nylon 6, a copolymer of nylon 6 and nylon 6, nylon 6, 10, and m-xylylene adipamide (MXD 6).
The base layer 1 may be formed of 1 resin film, or may be formed of 2 or more resin films in order to improve pinhole resistance and insulation properties. When the substrate layer 1 is formed of a plurality of resin films, 2 or more resin films may be laminated via an adhesive component such as an adhesive or an adhesive resin, and the type, amount, or the like of the adhesive component used is the same as in the case of the adhesive layer 2 or the adhesive layer 5 described later. The method for laminating 2 or more resin films is not particularly limited, and known methods can be used, and examples thereof include a dry lamination method, a sandwich lamination method, and the like, and preferably a dry lamination method. When the layers are laminated by a dry lamination method, an adhesive is preferably used as the adhesive layer. In this case, the thickness of the adhesive layer is, for example, about 0.5 to 10 μm.
The thickness of the base material layer 1 is not particularly limited as long as the battery packaging material satisfies the above physical properties, and may be, for example, about 10 to 50 μm, preferably about 15 to 25 μm.
(Metal layer 3)
In the battery packaging material, the metal layer 3 functions as a barrier layer for preventing water vapor, oxygen, light, and the like from entering the battery, in addition to improving the strength of the battery packaging material. Specific examples of the metal constituting the metal layer 3 include aluminum, stainless steel, and titanium, and aluminum is preferably used. The metal layer 3 may be formed by metal foil, metal vapor deposition, or the like, preferably by metal foil, and more preferably by aluminum foil. In addition, at least one surface, preferably both surfaces, of the metal layer 3 are subjected to chemical conversion treatment for stabilization of adhesion, prevention of dissolution, corrosion, or the like. Here, the chemical conversion treatment is a treatment for forming an acid-resistant coating film on the surface of the metal layer.
The thickness of the metal layer 3 is not particularly limited as long as the battery packaging material satisfies the above physical properties, and may be, for example, about 10 μm to 50 μm, preferably about 20 μm to 40 μm.
(sealant layer 4)
In the battery packaging material of the present invention, the sealant layer 4 corresponds to the innermost layer, and is a layer that seals the battery element by thermally welding the sealant layers to each other at the time of assembling the battery.
The resin component used for the sealant layer 4 is not particularly limited as long as it can be thermally welded, and examples thereof include polyolefins, cyclic polyolefins, carboxylic acid-modified polyolefins, and carboxylic acid-modified cyclic polyolefins.
Specific examples of the polyolefin include: polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene; polypropylene such as homopolypropylene, a block copolymer of polypropylene (for example, a block copolymer of propylene and ethylene), a random copolymer of polypropylene (for example, a random copolymer of propylene and ethylene), and the like; terpolymers of ethylene-butene-propylene, and the like. Among these polyolefins, polyethylene and polypropylene are preferable.
The cyclic polyolefin is a copolymer of an olefin and a cyclic monomer, and examples of the olefin as a constituent monomer of the cyclic polyolefin include ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, isoprene, and the like. Examples of the cyclic monomer as a constituent monomer of the cyclic polyolefin include cyclic olefins such as norbornene; specifically, cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene and norbornadiene. Among these polyolefins, cyclic olefins are preferable, and norbornene is more preferable.
The carboxylic acid-modified polyolefin is a polymer modified by block polymerization or graft polymerization of the polyolefin with a carboxylic acid. Examples of the carboxylic acid used for the modification include maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, and itaconic anhydride.
The carboxylic acid-modified cyclic polyolefin is a polymer obtained by copolymerizing a part of monomers constituting the cyclic polyolefin with an α, β -unsaturated carboxylic acid or an anhydride thereof, or by block polymerization or graft polymerization of an α, β -unsaturated carboxylic acid or an anhydride thereof to a cyclic polyolefin. The cyclic polyolefin to be subjected to carboxylic acid modification is the same as described above. The carboxylic acid used for the modification is the same as that used for the modification of the acid-modified cycloolefin copolymer.
The sealant layer 4 may be formed of 1 resin component alone, or may be formed of a polymer blend obtained by combining 2 or more resin components. Further, the sealant layer 4 may be formed of only 1 layer, or may be formed of 2 or more layers using the same or different resin components.
The thickness of the sealant layer 4 is not particularly limited as long as the battery packaging material satisfies the above physical properties, and may be, for example, about 10 to 100 μm, preferably about 15 to 50 μm.
(adhesive layer 5)
In the battery packaging material of the present invention, the adhesive layer 5 is a layer provided between the metal layer 3 and the sealant layer 4 as needed to strongly adhere them.
The adhesive layer 5 is formed by an adhesive capable of bonding the metal layer 3 and the sealant layer 4. As the adhesive layer used for the adhesive layer 5, known adhesives, for example, those obtained by combining a polyolefin resin and a polyfunctional isocyanate; an adhesive agent comprising a combination of a polyol and a polyfunctional isocyanate; or an adhesive containing a modified polyolefin resin, a heterocyclic compound and a curing agent. Alternatively, an adhesive such as acid-modified polypropylene may be melt-extruded onto the metal layer by a T-die extruder to form the adhesive layer 5, and the sealant layer 4 may be superimposed on the adhesive layer 5 to bond the metal layer 3 and the sealant layer 4.
When both the adhesive layer 2 and the adhesive layer 5 need to be aged, they may be aged together. The aging temperature is set to room temperature to 90 ℃ to complete curing for 2 days to 2 weeks, thereby exhibiting moldability.
The thickness of the adhesive layer 5 is not particularly limited as long as the battery packaging material satisfies the above physical properties, and may be, for example, about 0.5 to 50 μm, preferably about 2 to 30 μm.
[ coating layer 6]
In the battery packaging material of the present invention, the coating layer 6 may be provided on the base material layer 1 (on the side of the base material layer 1 opposite to the metal layer 3) as required for the purpose of improving design properties, electrolyte resistance, abrasion resistance, moldability, and the like. The coating layer 6 is a layer located at the outermost layer when the battery is assembled.
The coating layer 6 may be formed using, for example, polyvinylidene chloride, polyester resin, polyurethane resin, acrylic resin, epoxy resin, or the like. Of these, the coating layer 6 is preferably formed using a two-component curable resin. Examples of the two-component curable resin forming the coating layer 6 include a two-component curable polyurethane resin, a two-component curable polyester resin, and a two-component curable epoxy resin. The coating layer 6 may contain a matting agent.
Examples of the matting agent include fine particles having a particle diameter of about 0.5nm to 5 μm. The material of the matting agent is not particularly limited, and examples thereof include metals, metal oxides, inorganic substances, and organic substances. The shape of the matting agent is not particularly limited, and examples thereof include a spherical shape, a fibrous shape, a plate shape, an irregular shape, and a hollow spherical shape. Specific examples of the matting agent include talc, silica, graphite, kaolin, montmorillonite, synthetic mica, hydrotalcite, silica gel, zeolite, aluminum hydroxide, magnesium hydroxide, zinc oxide, magnesium oxide, aluminum oxide, neodymium oxide, antimony oxide, titanium oxide, cerium oxide, calcium sulfate, barium sulfate, calcium carbonate, calcium silicate, lithium carbonate, calcium benzoate, calcium oxalate, magnesium stearate, aluminum oxide, carbon black, nanocarbon type, high-melting nylon, crosslinked acrylic acid type, crosslinked styrene, crosslinked polyethylene, benzoguanamine, gold, aluminum, copper, nickel, and the like. These matting agents may be used alone in 1 kind, or in combination of 2 or more kinds. Among these matting agents, silica, barium sulfate, and titanium oxide are preferable from the viewpoint of dispersion stability, cost, and the like. The matting agent may be subjected to various surface treatments such as an insulating treatment and a high-dispersibility treatment on the surface.
The method for forming the coating layer 6 is not particularly limited, and for example, a method of applying a two-component curable resin forming the coating layer 6 to one surface of the base material layer 1 may be mentioned. When the matting agent is blended, the two-component curable resin may be mixed with the matting agent and then coated.
(method for producing Battery packaging Material)
The method for producing the battery packaging material of the present invention is not particularly limited as long as a laminate obtained by laminating layers having a predetermined composition can be obtained, and the following methods can be exemplified.
First, a laminate (hereinafter, also referred to as "laminate a") is formed by sequentially laminating a base material layer 1, an adhesive layer 2, and a metal layer 3. Specifically, the formation of the laminate a can be performed by a dry lamination method as follows: the adhesive for a battery packaging material of the present invention is applied to the outer layer side base material layer 1 or the metal layer 3 whose surface is chemically treated as necessary by a coating method such as extrusion, gravure coating, or roll coating, and dried, and then the metal layer 3 or the outer layer side base material layer 1 is laminated and the adhesive layer 2 is cured.
Next, a sealant layer 4 is laminated on the metal layer 3 of the laminate a. When the sealant layer 4 is directly laminated on the metal layer 3, the resin component constituting the sealant layer 4 may be applied to the metal layer 3 of the laminate a by a method such as gravure coating or roll coating. When the adhesive layer 5 is provided between the metal layer 3 and the sealant layer 4, examples thereof include: a method of laminating the adhesive layer 5 and the sealant layer 4 on the metal layer 3 of the laminate a by coextrusion (coextrusion lamination method); a method of separately forming a laminate in which the adhesive layer 5 and the sealant layer 4 are laminated, and laminating the laminate on the metal layer 3 of the laminate a by a heat lamination method; a method in which an adhesive for forming the adhesive layer 5 is laminated on the metal layer 3 of the laminate a by an extrusion method, a method of drying at high temperature by solution coating and further sintering, or the like, and a sealant layer 4 previously formed into a sheet shape is laminated on the adhesive layer 5 by a heat lamination method; a method (sandwich lamination method) of bonding the laminate a and the sealant layer 4 via the adhesive layer 5 while pouring the melted adhesive layer 5 between the metal layer 3 of the laminate a and the sealant layer 4 formed into a sheet in advance.
When the coat layer 6 is provided, the coat layer 6 is laminated on the surface of the outer-layer-side base material layer 1 opposite to the metal layer 3. The coating layer 6 can be formed by, for example, applying the above-described resin forming the coating layer 6 to the surface of the outer-layer-side substrate layer 1. The order of the step of laminating the metal layer 3 on the surface of the outer layer side base material layer 1 and the step of laminating the overcoat layer 6 on the surface of the outer layer side base material layer 1 is not particularly limited. For example, after the cover 6 is formed on the surface of the outer layer side base material layer 1, the metal layer 3 may be formed on the surface of the outer layer side base material layer 1 opposite to the cover 6.
The operation is carried out as described above, and a laminate comprising the overcoat layer 6/the outer-layer-side base material layer 1/the adhesive layer 2 provided as required, and the metal layer 3 whose surface is subjected to chemical conversion treatment as required, and the adhesive layer 5 provided as required/the sealant layer 4 can be formed, but the laminate may be further subjected to heat treatment such as heat roller contact type, hot air type, near or far infrared type or the like in order to enhance the adhesiveness between the adhesive layer 2 and the adhesive layer 5 provided as required. The conditions for the heat treatment include, for example, 150 to 250 ℃ for 1to 5 minutes.
In the battery packaging material of the present invention, each layer constituting the laminate may be subjected to a surface activation treatment such as corona treatment, sand blasting, oxidation treatment, or ozone treatment as required in order to improve or stabilize film formability, lamination processing, secondary processing (bagging, embossing) suitability of a final product, or the like.
(Container for battery)
The battery container of the present invention can be formed using the aforementioned battery outer packaging material, in such a manner that the outer layer side base material layer 1 forms a convex surface and the sealant layer 4 forms a concave surface.
As a method of forming the concave portion, there are the following methods:
heating and pressure molding method: a method of forming the concave portion by sandwiching the battery exterior material between a lower die having a hole for supplying high-temperature and high-pressure air and an upper die having a bag-shaped concave portion, and supplying air while heating and softening the materials.
A preheater flat plate press molding method: the battery exterior material is heated and softened, and then sandwiched between a lower die having a hole for supplying high-pressure air and an upper die having a bag-shaped recess, and air is supplied to form the recess.
Cylinder vacuum forming method: a method of forming the concave portion by partially heating and softening the battery exterior material with a heating cylinder and then evacuating the concave portion of the cylinder having the bag-like concave portion.
Bolt forming method: a method of heating and softening the substrate sheet and then pressing the substrate sheet with a bag-shaped concave-convex mold.
Pre-heater plug-assisted press forming: the method is a method for heating and softening the battery outer packaging material, clamping the battery outer packaging material between a lower die with a hole for supplying high-pressure air and an upper die with a bag-shaped concave part, and supplying air to form the concave part, wherein a convex die plug is lifted and lowered to assist the forming during the forming.
Among them, the pre-heater plug-assisted press molding method is preferable as the heating vacuum molding method in view of obtaining a uniform thickness of the substrate after molding.
(use of a packaging Material for batteries)
The battery packaging material of the present invention is used in the form of a battery container in which battery elements such as a positive electrode, a negative electrode, and an electrolyte are sealed and housed.
Specifically, the battery packaging material according to the present invention is a battery using the battery packaging material, in which a battery element including at least a positive electrode, a negative electrode, and an electrolyte is covered so that a flange portion (a region where sealant layers are in contact with each other) can be formed at the peripheral edge of the battery element in a state where metal terminals connected to the positive electrode and the negative electrode are protruded outward, and the sealant layers of the flange portion are sealed by heat sealing. When the battery element is housed in the battery packaging material of the present invention, the battery packaging material of the present invention is used so that the sealant portion thereof is on the inside (the surface in contact with the battery element).
The battery packaging material of the present invention can be used for either a primary battery or a secondary battery, and is preferably used for a secondary battery. The type of secondary battery to which the battery packaging material of the present invention is applied is not particularly limited, and examples thereof include a lithium ion battery, a lithium ion polymer battery, a lead storage battery, a nickel-hydrogen storage battery, a nickel-cadmium storage battery, a nickel-iron storage battery, a nickel-zinc storage battery, a silver oxide-zinc storage battery, a metal air battery, a polyvalent cation battery, a capacitor (condenser), and a capacitor (capacitor). Among these secondary batteries, preferable examples of the battery packaging material of the present invention include a lithium ion battery and a lithium ion polymer battery.
Examples
The present invention will be described in more detail below with reference to specific synthesis examples and examples, but the present invention is not limited to these examples. In the following examples, "part" and "%" represent "part by mass" and "% by mass", respectively, unless otherwise specified.
(Synthesis examples 1-1)
A flask equipped with a stirrer, a temperature sensor and a rectifying tube was charged with 791 parts by weight of isophthalic acid (manufactured by Mitsubishi gas chemical Co., Ltd.), 339 parts by weight of terephthalic acid (manufactured by Mitsubishi chemical Co., Ltd.), 20 parts by weight of trimellitic anhydride (manufactured by Mitsubishi gas chemical Co., Ltd.), 738 parts by weight of 1, 6-hexanediol (manufactured by BASF Co., Ltd.), 107 parts by weight of neopentyl glycol (manufactured by Mitsubishi gas chemical Co., Ltd.) and 4.0 parts by weight of an organotitanium compound ("ORGATIX TC-100" manufactured by Matsumoto Fine C chemical Co., Ltd.), and while stirring, dry nitrogen gas was introduced into the flask, water generated was distilled off and the temperature was raised to 240 ℃. Thereafter, the esterification reaction was carried out while increasing the degree of vacuum to 30torr, and the reaction was stopped when the acid value of the resin became 1.50mgKOH/g or less. The obtained polyester polyol was diluted with ethyl acetate to a resin solid content of 58% to obtain a polyester polyol (A1-1) having a number average molecular weight (Mn) of 7000, a weight average molecular weight (Mw) of 23500, a resin hydroxyl value of 22.4mgKOH/g, a resin acid value of 1.26mgKOH/g, and a glass transition temperature (Tg) of 2.1 ℃.
(Synthesis examples 1-2)
Into a flask equipped with a stirring rod, a temperature sensor and a concentration tube were charged 900 parts by weight of the obtained polyester polyol (A1-1), 0.16 parts by weight of an organotin compound ("NEOSTANN U-130", manufactured by Nindonghua chemical Co., Ltd.), 268 parts by weight of ethyl acetate and 9.53 parts by weight of hexamethylene diisocyanate ("Desmodur H", manufactured by Sumika Covestro Urethane Co., Ltd.), and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating the flask to 75 to 78 ℃ with stirring. When the NCO% of the resin was 0.25% or less, the reaction was stopped, and the solid resin component was diluted with ethyl acetate to 40% to obtain a polyester polyol (A1-2) having a number average molecular weight (Mn) of 11800, a weight average molecular weight (Mw) of 56300, a resin hydroxyl value of 8.5mgKOH/g, a resin acid value of 1.26mgKOH/g, and a glass transition temperature (Tg) of 8.4 ℃.
(Synthesis examples 1to 3)
900 parts by weight of the obtained polyester polyol (A1-1), 0.16 part by weight of an organotin compound, 270 parts by weight of ethyl acetate and 11.10 parts by weight of hexamethylene diisocyanate were charged into a flask equipped with a stirring rod, a temperature sensor and a concentration tube, and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating the flask to 75 to 78 ℃ while stirring. When the NCO% of the resin was 0.25% or less, the reaction was stopped, and the resulting resin was diluted with ethyl acetate so that the resin solid content became 40%, whereby a polyester polyol (A1-3) having a number average molecular weight (Mn) of 12400, a weight average molecular weight (Mw) of 71200, a resin hydroxyl value of 7.0mgKOH/g, a resin acid value of 1.31mgKOH/g, and a glass transition temperature (Tg) of 9.0 ℃ was obtained.
(Synthesis examples 1to 4)
900 parts by weight of the obtained polyester polyol (A1-1), 0.16 part by weight of an organotin compound, 272 parts by weight of ethyl acetate and 12.68 parts by weight of hexamethylene diisocyanate were charged into a flask equipped with a stirrer, a temperature sensor and a condenser, and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating the flask to 75 to 78 ℃ while stirring. When the NCO% of the resin was 0.25% or less, the reaction was stopped, and the solid resin component was diluted with ethyl acetate to 40% to obtain a polyester polyol (A1-4) having a number average molecular weight (Mn) of 12100, a weight average molecular weight (Mw) of 99400, a resin hydroxyl value of 5.2mgKOH/g, a resin acid value of 1.29mgKOH/g, and a glass transition temperature (Tg) of 9.4 ℃.
(Synthesis examples 1to 5)
A flask equipped with a stirring rod, a temperature sensor and a condenser was charged with 900 parts by weight of the obtained polyester polyol (A1-1), 0.16 part by weight of an organotin compound ("NEOSTANN J-130" manufactured by Nindonghua chemical Co., Ltd.), 273 parts by weight of ethyl acetate and 13.47 parts by weight of hexamethylene diisocyanate, and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating the flask to 75 to 78 ℃ while stirring. When the NCO% of the resin was 0.25% or less, the reaction was stopped, and the solid resin component was diluted with ethyl acetate to 40% to obtain a polyester polyol (A1-5) having a number average molecular weight (Mn) of 13700, a weight average molecular weight (Mw) of 128600, a resin hydroxyl value of 7.6mgKOH/g, a resin acid value of 1.35mgKOH/g, and a glass transition temperature (Tg) of 9.9 ℃.
(Synthesis examples 1to 6)
900 parts by weight of the obtained polyester polyol (A1-1), 0.16 part by weight of an organotin compound, 278 parts by weight of ethyl acetate and 17.75 parts by weight of isophorone diisocyanate ("VESTANAT IPDI" manufactured by Evonik corporation) were charged into a flask equipped with a stirring rod, a temperature sensor and a concentration tube, and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating to 75 to 78 ℃ while stirring. When the NCO% of the resin was 0.25% or less, the reaction was terminated, and the resin was diluted with ethyl acetate so that the resin solid content became 30%, whereby a polyester polyol (A1-6) having a number average molecular weight (Mn) of 13800, a weight average molecular weight (Mw) of 91300, a resin hydroxyl value of 7.6mgKOH/g, a resin acid value of 1.39mgKOH/g, and a glass transition temperature (Tg) of 12.8 ℃ was obtained.
(Synthesis examples 1to 7)
74.9 parts by weight of the polyester polyol (A1-1), 23.4 parts by weight of ethyl acetate, 1.7 parts by weight of 4, 4-diphenylmethane diisocyanate ("Lupranate MT", manufactured by Tosoh corporation) and 0.01 part by weight of an organotin compound were charged into a flask equipped with a stirrer, a temperature sensor and a condenser, and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating the flask to 75 to 78 ℃ with stirring. When the weight% of isocyanate reached 0.05% or less, the reaction was terminated, and the resulting resin was diluted with methyl ethyl ketone to give a resin solid content of 30%, thereby obtaining a polyester polyol (A1-7) having a number average molecular weight (Mn) of 12000, a weight average molecular weight (Mw) of 168900, a hydroxyl value of 6.8mgKOH/g, an acid value of 1.34mgKOH/g, and a glass transition temperature (Tg) of 14.9 ℃.
Synthesis example 2-1 Synthesis of polyester polyol (A2-1)
A flask equipped with a stirrer, a temperature sensor, and a rectifying tube was charged with 1102 parts by weight of isophthalic acid (manufactured by Mitsubishi gas Chemical corporation), 473 parts by weight of terephthalic acid (manufactured by Mitsubishi Chemical corporation), 1070 parts by weight of 1, 6-hexanediol (manufactured by BASF corporation), 156 parts by weight of neopentyl glycol (manufactured by Mitsubishi gas Chemical corporation), and 0.46 parts by weight of an organic titanium compound ("ORGATIX TC-100" manufactured by Matsumoto Fine Chemical corporation), and while stirring, dry nitrogen gas was introduced into the flask, and while distilling off the produced water, the temperature was raised to 240 ℃. Thereafter, the esterification reaction was carried out while increasing the degree of vacuum to 30torr, and the reaction was stopped when the acid value of the resin became 2.00mgKOH/g or less. After cooling to 150 ℃, the resulting mixture was diluted with a mixed solution of ethyl acetate/toluene (mixing ratio 1: 1) so as to obtain 50% of the solid resin content, thereby obtaining a polyester polyol (a2-1) having a number average molecular weight (Mn) of 4000, a weight average molecular weight (Mw) of 9700, a resin hydroxyl value (in terms of solid content) of 38.8mgKOH/g, a resin acid value (in terms of solid content) of 0.63mgKOH/g, and a glass transition temperature (Tg) of 2.8 ℃.
Synthesis example 2-2 Synthesis of polyester polyol (A2-2)
A flask equipped with a stirring rod, a temperature sensor and a condenser was charged with 1000 parts by weight of the polyester polyol (A2-1), 25.7 parts by weight of hexamethylene diisocyanate ("Desmodur H", manufactured by Sumika Covestro Urethane Co., Ltd.) and 0.16 part by weight of an organotin compound ("NEOSTANN U-130", manufactured by Nidoku chemical Co., Ltd.), and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating the mixture to 75 to 78 ℃ with stirring. When the weight% of isocyanate reached 0.05% or less, the reaction was terminated, and the resulting mixture was diluted with a mixed solvent of ethyl acetate/toluene (mixing ratio 1: 1) to obtain 50% of the solid resin content, thereby obtaining a polyester polyol (A2-2) having a number average molecular weight (Mn) of 11000, a weight average molecular weight (Mw) of 50000, a resin hydroxyl value (in terms of solid content) of 3.9mgKOH/g, a resin acid value (in terms of solid content) of 1.06mgKOH/g, and a glass transition temperature (Tg) of 7.1 ℃.
Synthesis example 2-3 Synthesis of polyester polyol (A2-3)
A flask equipped with a stirring rod, a temperature sensor and a condenser was charged with 1000 parts by weight of the polyester polyol (A2-1), 26.0 parts by weight of toluene diisocyanate ("COSMONATE T-80" manufactured by Mitsui chemical Co., Ltd.), and 0.16 part by weight of an organotin compound ("NEOSTANN U-130" manufactured by Nidoku K.K.) and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating the flask to 75 to 78 ℃ while stirring. When the weight% of isocyanate reached 0.05% or less, the reaction was terminated, and the resulting mixture was diluted with a mixed solvent of ethyl acetate/toluene (mixing ratio 1: 1) to obtain 50% of the solid resin content, thereby obtaining a polyester polyol (A2-3) having a number average molecular weight (Mn) of 16000, a weight average molecular weight (Mw) of 47000, a resin hydroxyl value (in terms of solid content) of 4.9mgKOH/g, a resin acid value (in terms of solid content) of 0.70mgKOH/g, and a glass transition temperature (Tg) of 13.3 ℃.
Synthesis examples 2 to 4 Synthesis of polyester polyol (A2-4)
A flask equipped with a stirring rod, a temperature sensor and a condenser was charged with 1000 parts by weight of the polyester polyol (A2-1), 28.1 parts by weight of m-xylylene diisocyanate ("TAKENATE 500" manufactured by Mitsui chemical Co., Ltd.) and 0.16 part by weight of an organotin compound ("NEOSTANN U-130" manufactured by Nidoku K.K.) and a chain extension reaction was carried out by flowing dry nitrogen gas into the flask and heating the flask to 75 to 78 ℃ with stirring. When the weight% of isocyanate reached 0.05% or less, the reaction was terminated, and the resulting mixture was diluted with a mixed solvent of ethyl acetate/toluene (mixing ratio 1: 1) to obtain 50% of the solid resin content, thereby obtaining a polyester polyol (A2-4) having a number average molecular weight (Mn) of 11000, a weight average molecular weight (Mw) of 28000, a resin hydroxyl value (in terms of solid content) of 6.1mgKOH/g, a resin acid value (in terms of solid content) of 0.64mgKOH/g, and a glass transition temperature (Tg) of 6.1 ℃.
Synthesis example 3-1 Synthesis of polyester polyol (A3-1)
A flask equipped with a stirrer, a temperature sensor, and a rectifying tube was charged with 1261 parts by weight of isophthalic acid (manufactured by Mitsubishi gas Chemical Co., Ltd.), 540 parts by weight of terephthalic acid (manufactured by Mitsubishi Chemical Co., Ltd.), 667 parts by weight of 1, 6-hexanediol (manufactured by BASF Co., Ltd.), 182 parts by weight of neopentyl glycol (manufactured by Mitsubishi gas Chemical Co., Ltd.), 253 parts by weight of ethylene glycol (manufactured by Mitsubishi Chemical Co., Ltd.), and 0.5 parts by weight of an organic titanium compound (manufactured by Matsumofine Chemical Co., Ltd. "ORGATIX TC-100") and heated to 240 ℃ while distilling off water produced while flowing dry nitrogen gas into the flask under stirring. Thereafter, the esterification reaction was carried out while increasing the degree of vacuum to 30torr, and the reaction was stopped when the resin acid value became 2.00mgKOH/g or less, and after cooling to 150 ℃, the reaction was diluted with a mixed solution of ethyl acetate/toluene (mixing ratio 1: 1) so as to become 50% of the resin solid content, thereby obtaining a polyester polyol (A3-1) having a number average molecular weight (Mn) of 6700, a weight average molecular weight (Mw) of 17000, a resin hydroxyl value of 17.2mgKOH/g, a resin acid value of 1.58mgKOH/g, and a glass transition temperature (Tg) of 23.6 ℃.
Synthesis example 3-2 Synthesis of polyester polyol (A3-2)
A flask equipped with a stirrer, a temperature sensor, and a rectifying tube was charged with 1261 parts by weight of isophthalic acid (manufactured by Mitsubishi gas Chemical Co., Ltd.), 540 parts by weight of terephthalic acid (manufactured by Mitsubishi Chemical Co., Ltd.), 889 parts by weight of 1, 6-hexanediol (manufactured by BASF Co., Ltd.), 171 parts by weight of neopentyl glycol (manufactured by Mitsubishi gas Chemical Co., Ltd.), 102 parts by weight of ethylene glycol (manufactured by Mitsubishi Chemical Co., Ltd.), and 0.5 parts by weight of an organic titanium compound (manufactured by Matsumoto Fine Chemical Co., Ltd. "ORGATIX TC-100"), and while stirring, dry nitrogen gas was flowed into the flask, water produced by distillation was heated to 240 ℃. Thereafter, the esterification reaction was carried out while increasing the degree of vacuum to 30torr, and the reaction was stopped when the resin acid value became 2.00mgKOH/g or less, and after cooling to 150 ℃, the resulting resin was diluted with a mixed solution of ethyl acetate/toluene (mixing ratio 1: 1) so as to become 50% of the resin solid content, thereby obtaining a polyester polyol (A3-2) having a number average molecular weight (Mn) of 12000, a weight average molecular weight (Mw) of 28000, a resin hydroxyl value of 10.1mgKOH/g, a resin acid value of 1.98mgKOH/g, and a glass transition temperature (Tg) of 15.6 ℃.
Synthesis example 3-3 Synthesis of polyester polyol (A3-3)
A flask equipped with a stirrer, a temperature sensor and a rectifying tube was charged with 1169 parts by weight of isophthalic acid (Mitsubishi gas Chemical Co., Ltd.), 501 parts by weight of terephthalic acid (Mitsubishi Chemical Co., Ltd.), 1042 parts by weight of 1, 6-hexanediol (BASF Co., Ltd.), 168 parts by weight of neopentyl glycol (Mitsubishi gas Chemical Co., Ltd.), and 0.5 parts by weight of an organic titanium compound ("ORGATIX TC-100" from Matsumoto Fine Chemical Co., Ltd.), and while stirring, dry nitrogen gas was flowed into the flask, and while distilling off the produced water, the temperature was raised to 240 ℃. Thereafter, the esterification reaction was carried out while increasing the degree of vacuum to 30torr, and the reaction was stopped when the resin acid value became 2.00mgKOH/g or less, and after cooling to 150 ℃, the resulting resin was diluted with a mixed solution of ethyl acetate/toluene (mixing ratio 1: 1) so as to become 50% of the resin solid content, thereby obtaining a polyester polyol (A3-3) having a number average molecular weight (Mn) of 13000, a weight average molecular weight (Mw) of 29000, a resin hydroxyl value of 9.5mgKOH/g, a resin acid value of 0.18mgKOH/g, and a glass transition temperature (Tg) of 8.2 ℃.
(comparative Synthesis example 1)
A flask equipped with a stirrer, a temperature sensor and a rectifying tube was charged with 164 parts by weight of neopentyl glycol, 1125 parts by weight of 1, 6-hexanediol, 351 parts by weight of terephthalic acid, 351 parts by weight of isophthalic acid, 928 parts by weight of adipic acid and 0.89 part by weight of an organic titanium compound, and while stirring, dry nitrogen gas was introduced into the flask, the temperature was raised to 240 ℃ while distilling off the water produced. Thereafter, the esterification reaction was carried out while increasing the degree of vacuum to 30torr, and the reaction was stopped when the resin acid value became 2.00mgKOH/g or less, and after cooling to 150 ℃, the reaction was diluted with ethyl acetate so as to become 60.0% of the resin solid content, thereby obtaining a polyester polyol (AH-1) having a number average molecular weight (Mn) of 5200, a weight average molecular weight (Mw) of 32000, a resin hydroxyl value of 6.6mgKOH/g, a resin acid value of 1.86mgKOH/g, and a glass transition temperature (Tg) of-43.6 ℃.
The physical properties of the polyester polyol obtained in the above synthesis example were measured as follows.
(molecular weight measurement method)
A measuring device: HLC-8320GPC, manufactured by Tosoh corporation
Column: TSKgel 4000HXL, TSKgel 3000HXL, TSKgel 2000HXL, TSKgel 1000HXL manufactured by Tosoh Kabushiki Kaisha
A detector: RI (differential refractometer)
Data processing: Multi-Station GPC-8020model II available from Tosoh corporation
The measurement conditions were as follows: column temperature 40 deg.C
Tetrahydrofuran as developing solvent
Flow rate 0.35 ml/min
The standard is as follows: monodisperse polystyrene
A sample: obtained by filtering a tetrahydrofuran solution (0.2 mass% in terms of solid content of resin) through a microfilter (100. mu.l)
(acid value measurement method)
A sample (5.0 g) was weighed out, dissolved in 30mL of tetrahydrofuran, and titrated with 0.1N potassium hydroxide solution (methanolic). Phenolphthalein was used as the indicator. The measurement results were expressed in mgKOH/g in terms of the amount of potassium hydroxide required for neutralizing 1g of the sample. When the sample contains an organic solvent, the acid value directly measured by the above-mentioned measurement method is converted into a solid acid value using the nonvolatile component value of the solution.
(measurement of hydroxyl value)
A sample (4.0 g) was weighed out, 25mL of an acetylating agent comprising acetic anhydride/pyridine (capacity ratio: 1/19) was added thereto, and the mixture was sealed and heated at 100 ℃ for 1 hour. After acetylation, 10mL of ion-exchanged water and 100mL of tetrahydrofuran were added, and titration was performed using a 0.5N potassium hydroxide solution (alcoholic). Phenolphthalein was used as the indicator. The measurement result was expressed in mgKOH/g in terms of the amount of potassium hydroxide required for neutralizing acetic acid produced when 1g of the sample was acetylated. When the sample contains an organic solvent, the hydroxyl value directly measured by the above-mentioned measurement method is converted into a solid-content hydroxyl value using the nonvolatile-component value of the solution.
(glass transition temperature measurement method)
A5 mg sample was heated from room temperature to 200 ℃ at 10 ℃/min under a 30mL/min nitrogen gas stream by DSC, cooled to-80 ℃ at 10 ℃/min, heated again to 150 ℃ at 10 ℃/min, and the DSC curve was measured. In the measurement results observed in the second temperature-raising step, the intersection point of the straight line extending from the base line on the low temperature side to the high temperature side and the tangent drawn from the point at which the gradient of the curve of the stepped portion of the glass transition becomes maximum is defined as the glass transition point, and the temperature at that time is defined as the glass transition temperature.
< preparation of adhesive for Battery packaging Material >
(example 1-1)
To 10 parts of polyester polyol (A1-2), 0.07 part of KBM-403 (nonvolatile content of silane coupling agent, manufactured by shin-Etsu chemical Co., Ltd.: 100%) was added and stirred sufficiently until the KBM-403 was completely dissolved, and then 2 parts of KW-75 (nonvolatile content of polyisocyanate, manufactured by DIC Co., Ltd.: 75% NCO: 13.3) was added and ethyl acetate was added so that the nonvolatile content became 25%, and stirred sufficiently to prepare adhesive (1-1) for a battery packaging material.
Examples 1-2 to 1-6
Adhesives (1-2) to (1-6) for a battery packaging material were produced in the same manner as in example 1-1, except that the materials and formulations described in table 1 were used.
Examples 1to 7 to examples 1to 11
Adhesives (1-7) to (1-11) for a battery packaging material were produced in the same manner as in example 1-1, except that the materials and formulations described in table 2 were used.
(examples 2-1) to 2-6)
The adhesives for battery packaging materials of examples 2-1 to 2-6 were produced in the same manner as in example 1-1, except that the materials and the formulation shown in Table 3 were used.
Example 3-1, example 3-2
The adhesives for battery packaging materials of examples 3-1 and 3-2 were produced in the same manner as in example 1-1, except that the materials and the formulation shown in Table 3 were used.
Comparative example 1
An adhesive (1-12) for a battery packaging material was produced in the same manner as in example 1-1, except that the materials and the formulation shown in table 4 were used.
In the numerical values in tables 1to 4, the blending amounts of the polyester polyols (A1-2) to (A1-5), (A2-2) to (A2-3), (A3-1) to (A3-3) and AH-1) were values including solvents, and the solid content amounts thereof were as described in the above synthesis examples. The mixing amount of KBM403 is the amount of solid component. The compounding amount of KW-75 is the value including the solvent. The blending amount of YS Polystar (terpene phenol resin, manufactured by YASUHARA CHEMICAL) was the solid content.
< production of Battery packaging Material FIG. 2 construction >
(example 1-1)
An adhesive (1-1) for a battery packaging material as an adhesive layer 2 was applied to the matte side of a 30 μm thick aluminum foil as a metal layer 3 in a dry laminator in an amount such that the applied amount after drying became 4 g/m, and after volatilizing the solvent, a 25 μm thick stretched polyamide film as an outer layer side substrate layer 1 was laminated.
Next, the adhesive P for the adhesive layer 5 was applied to the glossy surface of the aluminum foil of the metal layer 3 of the obtained laminated film in an amount of 4 g/m by a dry laminator to evaporate the solvent, and then an unstretched polypropylene film having a thickness of 40 μm was laminated as the sealant layer 4, followed by curing (aging) at 80 ℃ for 2 days to cure the adhesive, thereby obtaining a laminate.
Outer side substrate layer 1: polyamide membrane "EMBLM" 25 μm (manufactured by UNITIKA Co., Ltd.)
Adhesive layer 2: example adhesive for packaging Material for batteries (1)
Metal layer 3: 30 μm aluminum foil 1N30 (Toyo aluminum Co., Ltd.),
Sealant layer 4: unstretched Polypropylene film "Aroma ET 20" 40 μm (manufactured by Okamoto Co., Ltd.)
Adhesive P for adhesive layer 5: an adhesive prepared by compounding "EXP 130610 base" (manufactured by DIC) and "Additive EP-200" (manufactured by DIC) as curing agents in a weight ratio of 100/4
Examples 1-2 to 1-11
The same procedures as in example 1-1 were carried out using the adhesives (1-2) to (1-11) for battery packaging materials as the adhesive layer 2, thereby obtaining battery packaging materials of examples 1-2 to 1-11.
(examples 2-1) to 2-6)
The same procedures as in example 1-1 were carried out, using the adhesive for battery packaging materials of examples 2-1 to 2-6 as the adhesive layer 2, to obtain the battery packaging materials of examples 2-1 to 2-6.
Example 3-1, example 3-2
The same procedures as in example 1-1 were carried out using the adhesives for battery packaging materials of examples 3-1 and 3-2 as the adhesive layer 2, thereby obtaining battery packaging materials of examples 3-1 and 3-2.
Comparative example 1
The same procedure as in example 1-1 was repeated except that the adhesive (1-12) for a battery packaging material was used, to obtain a battery packaging material of comparative example 1.
(evaluation method)
Evaluation of the battery packaging material was performed as follows.
< adhesion Strength >
The adhesive strength at the interface between the outer layer side base material layer 1 and the metal layer 3 of the packaging material for a battery of examples or comparative examples was evaluated under conditions of a peeling speed of 100mm/min, a peeling width of 15mm, and a peeling pattern of 180 ° using an Autograph AGS-J manufactured by Shimadzu corporation. The higher the numerical value, the more suitable it is as an adhesive for a battery packaging material.
< moldability >
The battery packaging material of the examples or comparative examples was cut into a size of 60 × 60mm using a "1 ton bench servo press (SBN-1000)" manufactured by shanggang, ltd. The above-described blank was subjected to stretch forming with a forming height of 3.0mm or 3.5mm using a straight die having a free forming height so that the matte surface of the aluminum foil became convex, and formability was evaluated based on the presence or absence of cracking of the aluminum foil and the presence or absence of floating between the layers.
The punch shape of the die used was: a square with a side of 30mm, a corner R2mm, and a punch shoulder R1 mm. The die hole shape of the used die is as follows: one side 34mm square, die corner R2mm, die shoulder R: 1mm, and the clearance between the punch and the die hole is 0.3mm on one side. An inclination corresponding to the forming height is generated according to the gap.
O: no cracking of aluminum foil, no floating between layers, and excellent practical use
And (delta): although pinhole-like aluminum foil was observed, no cracking of aluminum foil and no floating between layers were observed, and the range of practical use was found
X: the aluminum foil is largely broken or floating between layers
< Heat resistance >
The battery packaging material of the examples or comparative examples was cut into a size of 60 × 60mm using a "1 ton bench servo press (SBN-1000)" manufactured by shanggang, ltd, and was stretch-molded at a molding height of 3.0mm using a straight mold having a free molding height such that the aluminum foil matte surface was located on the outside. The flange portion of the obtained 30mm square tray was sequentially touched to a heat sealing bar at 190 ℃ for 3 seconds at 4 sides so as to contact the side wall portion, and the appearance of the vicinity of the boundary portion between the flange portion and the side wall portion of each side was confirmed to evaluate whether or not floating occurred between the stretched polyamide film and the aluminum foil. 2 samples were prepared, and 8 sides in total were checked, and evaluated in 3 ranks as described below.
O: no float (excellent in practice)
And (delta): float at 1to 4 sides in 8 sides (practical range)
X: float at 5 to 8 sides among 8 sides
< moist Heat resistance >
The battery packaging material of the examples or comparative examples was cut into a size of 60 × 60mm using a "1 ton bench servo press (SBN-1000)" manufactured by shanggang, ltd, and was stretch-molded at a molding height of 3.0mm using a straight mold having a free molding height such that the aluminum foil matte surface was located on the outside. The obtained square tray of 30mm was placed in a constant temperature and humidity bath at 85 ℃ under 95% RH atmosphere, and allowed to stand for 168 hours. The tray was taken out from the constant temperature and humidity chamber, and the appearance of the vicinity of the boundary between the flange portion and the side wall portion was confirmed, to evaluate whether or not the floating occurred between the stretched polyamide film and the aluminum foil. 2 samples were prepared, and 8 sides in total were checked, and evaluated in 3 ranks as described below.
O: no float (excellent in practice)
And (delta): float at 1to 4 sides in 8 sides (practical range)
X: float at 5 to 8 sides among 8 sides
The results are shown in tables 1to 4. In example 3-1, the outer layer side substrate layer 1 was broken when the adhesive strength was measured, and thus a correct value could not be obtained.
[ Table 1]
[ Table 2]
[ Table 3]
[ Table 4]
(example 4-1)
To 100 parts of polyester polyol A2-2, 0.5 part of KBM-403 (nonvolatile silane coupling agent 100%, manufactured by shin-Etsu chemical Co., Ltd.) was added and sufficiently stirred until the KBM-403 was completely dissolved, and then 38.7 parts of KW-75 (nonvolatile polyisocyanate 75%, manufactured by DIC Co., Ltd.: 75% NCO%: 13.3) and ethyl acetate were added so that the nonvolatile content became 25%, and sufficiently stirred to prepare an adhesive of example 4-1.
(examples 4-2) to 4-12)
Adhesives of examples 4-2 to 4-12 were produced in the same manner as in example 4-1, except that the materials and formulations shown in tables 5 and 6 were used.
The numerical values in tables 5 and 6 are in terms of solid content (or nonvolatile content).
The silane coupling agents used in the examples are described in detail below (all manufactured by shin-Etsu chemical Co., Ltd.).
KBM-403: 3-glycidoxypropyltrimethoxysilane
KBM-1003: vinyl trimethoxy silane
KBE-9007N: 3-isocyanatopropyltriethoxysilane
X-12-981S: polymeric multifunctional epoxy silanes
KBM-303: 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane KBM-402: 3-glycidoxypropylmethyldimethoxysilane
KBM-4803: glycidoxy octyl trimethoxy silane
The ketone resins used in the examples are as follows.
Variplus AP: ketone-aldehyde condensation resin (Evonik Co., Ltd.)
The same procedures as in example 1-1 were carried out using the adhesives of examples 4-1 to 4-12 to obtain packaging materials for batteries of examples 4-1 to 4-12. The obtained battery packaging material was subjected to stretch molding in the same manner as in example 1-1, except that the molding height was changed from 3.0mm to 5.0mm as described below, and the moldability was evaluated. The results are summarized in tables 5 and 6.
[ Table 5]
[ Table 6]
(example 5-1)
To 100 parts of polyester polyol (A2-2), 1 part of KBM-403 (nonvolatile silane coupling agent component 100%, manufactured by shin-Etsu chemical Co., Ltd.) was added and sufficiently stirred until the KBM-403 was completely dissolved, and then 5.3 parts of HARITACK PH (stabilized rosin ester, manufactured by Harima chemical Co., Ltd.), 1.3 parts of Variplus AP (ketone-aldehyde condensation resin, manufactured by Evonik Co., Ltd.) and 23 parts of KW-75 (nonvolatile polyisocyanate component 75% NCO, manufactured by DIC Co., Ltd.: 13.3) were added and ethyl acetate was added so that the nonvolatile content became 25%, and sufficiently stirred, thereby producing the adhesive for battery packaging material of example 5-1.
Examples 5-2 to 5-6
The adhesives for battery packaging materials of examples 5-2 to 5-6 were produced in the same manner as in example 5-1, except that the materials and the formulation shown in Table 7 were used.
The numerical values in table 7 are in terms of solid content (or nonvolatile content).
The tackifiers used in the examples and reference examples are described in detail below.
HARITACK PH: stabilized rosin ester (Harima chemical)
HARITACK FK100, 100: stabilized rosin ester (Harima chemical)
YS Polystar K125: terpene phenol resin (manufactured by YASUHARA CHEMICAL)
YS Polystar TH 130: terpene phenol resin (manufactured by YASUHARA CHEMICAL)
YS Polystar T130: terpene phenol resin (manufactured by YASUHARA CHEMICAL)
The same procedures as in example 1-1 were carried out using the adhesives of examples 5-1 to 5-6 to obtain packaging materials for batteries of examples 5-1 to 5-6. The obtained battery packaging material was evaluated for moldability in the same manner as in example 4-1, and the results are summarized in Table 7.
[ Table 7]
From this result, it can be seen that: by using the adhesive for a battery packaging material of the present invention, a battery packaging material having excellent moldability, which is free from a decrease in the interlayer adhesive strength and appearance defects such as floating between layers even after heat-sealing of sealant layers for sealing a battery element and further after a long-term durability test under high temperature and high humidity, can be obtained.
Description of the symbols
1. Outer side substrate layer
2. Adhesive layer
3. Metal layer
4. Sealant layer
5. Adhesive layer
Claims (15)
1. An adhesive for a battery packaging material, which is an adhesive for a battery packaging material comprising a polyol composition A and a polyisocyanate composition B as essential components, wherein,
the polyol composition A comprises a polyester polyol which is essentially prepared from a polybasic acid or a derivative thereof and a polyhydric alcohol, wherein the polybasic acid or the derivative thereof is a polybasic acid or a derivative thereof having an aromatic ring, and the polyester polyol has a number average molecular weight of 3000 to 16000 and a glass transition temperature of-30 to 23.6 ℃.
2. The adhesive for a packaging material for a battery according to claim 1, wherein the polyol raw material comprises a branched alkylene glycol.
3. The adhesive for a battery packaging material according to claim 2, wherein the branched alkylene glycol content in 100 mol% of the polyol is 5 mol% or more and 95 mol% or less.
4. The adhesive for a battery packaging material according to claim 1, wherein the polyester polyol comprises a polybasic acid or a derivative thereof, a polyhydric alcohol, and a polyisocyanate as essential raw materials.
5. The adhesive for a battery packaging material according to claim 1, wherein the polyester polyol is a reaction product of a polyester polyol prepared from a polybasic acid or a derivative thereof and a polyhydric alcohol as essential raw materials, and a polyisocyanate.
6. The adhesive for battery packaging material according to claim 1, wherein the polybasic acid or derivative thereof is selected from the group consisting of phthalic acid, phthalic anhydride, methyl ester compound of phthalic acid, terephthalic acid, methyl ester compound of terephthalic acid, trimellitic anhydride, and methyl ester compound of trimellitic anhydride.
7. The adhesive for a battery packaging material according to claim 1, further comprising an adhesion promoter.
8. The adhesive for a battery packaging material according to claim 1, further comprising a tackifier having a softening point of 80 ℃ to 160 ℃.
9. The adhesive for battery packaging materials according to claim 8, wherein the tackifier comprises a hydrogenated rosin-based tackifier having an acid value of 2mgKOH/g to 10 mgKOH/g.
10. The adhesive for a battery packaging material according to claim 8 or 9, wherein the tackifier comprises a terpene-phenol resin.
11. The adhesive for a packaging material for a battery according to claim 1, further comprising a silane coupling agent.
12. The adhesive for a battery packaging material according to claim 1, wherein the silane coupling agent is contained in an amount of 0.1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the solid content of the polyol composition A.
13. A battery packaging material comprising at least an outer layer-side base material layer 1, an adhesive layer 2, a metal layer 3, and a sealant layer 4 laminated in this order, wherein the adhesive layer 2 is a cured product of the adhesive for battery packaging material according to any one of claims 1to 12.
14. A battery container produced by molding the battery packaging material according to claim 13.
15. A battery produced by using the battery container according to claim 14.
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JP2017-127445 | 2017-06-29 | ||
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PCT/JP2017/045472 WO2018117080A1 (en) | 2016-12-20 | 2017-12-19 | Battery packaging material adhesive, battery packaging material, battery container, and battery |
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EP3884009A4 (en) * | 2018-11-22 | 2022-06-08 | Dow Global Technologies LLC | Adhesive composition |
WO2020179609A1 (en) * | 2019-03-05 | 2020-09-10 | Dic株式会社 | Adhesive, adhesive for battery packaging material, laminate, battery packaging material, battery container, and battery |
JP7024911B2 (en) * | 2019-03-05 | 2022-02-24 | Dic株式会社 | Adhesives, battery packaging adhesives, laminates, battery packaging materials, battery containers and batteries |
CN113825817B (en) * | 2019-06-03 | 2023-10-27 | Dic株式会社 | Adhesive, adhesive for battery packaging material, laminate, battery packaging material, battery container, and battery |
CN113993966A (en) * | 2019-08-26 | 2022-01-28 | Dic株式会社 | 2-liquid adhesive, laminate, molded body, and packaging material |
JP6996546B2 (en) * | 2019-12-20 | 2022-01-17 | 東洋インキScホールディングス株式会社 | Packaging materials for power storage devices, containers for power storage devices and power storage devices |
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- 2017-12-19 CN CN201780077293.5A patent/CN110072964B/en active Active
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JP6528980B2 (en) | 2019-06-12 |
WO2018117080A1 (en) | 2018-06-28 |
TW201835147A (en) | 2018-10-01 |
TWI749129B (en) | 2021-12-11 |
US20200106061A1 (en) | 2020-04-02 |
JPWO2018117080A1 (en) | 2019-03-07 |
US11063313B2 (en) | 2021-07-13 |
CN110072964A (en) | 2019-07-30 |
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